Gorebyss and Huntail are the next evolution of Clamperl, somewhere in the game you get the choice between a deepseascale or a deepseatooth... You give it to your Clamperl and then trade your Clamperl as it is holding it.
The deepseascale makes it turn into a Gorebyss
The deepseatooth makes it turn into a Huntail
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huntail has more attack and gorebyss has more defense
Clampearl has two possible evolutions - Huntail and Gorebyss (this is also called a branch evolution). To evolve a Clampearl into either one of the two possibilities, a special item must be equiped to it and the Clampearl traded. To evolve it into a Huntail, a Deepsea Tooth is needed. To evolve it into a Gorebyss, a Deepsea Scale is needed. One of the two items can be obtained in Pokemon Ruby or Sapphire as a reward from Captain Stern in Slateport City.
You can not go out and catch huntail in the wild you have to have a clampearl and give it a deep sea tooth.
If given to clampearl then traded it will become huntail.
You have to equip either a deepseascale or a deepseatooth to clampearl and trade it. If you use a deepseascale you are suppose to get Gorebyss, I don't know what you get if you use a deepseatooth. If someone know please do tell. Thank You. If You Trade Clampearl with a deepseatooth it evolves into a huntail.